Cushion mounting



H. c. RUBLY Erm.

cUsHIoN MOUNTING f Filed June 16, 1942 FIG. 2

Patented May 2, 1944 oUsmoN MOUNTING Harry C. Rubly, Millburn, and Clarence E. Young, Lincoln Park, N. J., assignors to Bell Telephone Laboratories, Incorporated, New corporation of New York York, N. Y., a

aannemen :une 16,1942, semi No. 447,294

l1o claims. (ci. 24a-35s) This invention relates to cushion mountings and more particularly to such mountings for electron discharge devices.

These devices usually contain a plurality of frail electrodes, such as-a filamentary or equi- Y potential type cathode and one or more wire wound grids which are uniformly spaced with respect to an output electrode or anode in an enclosing vessel, to attain appropriate electrical characteristics which must be maintained stable. to realize the highest eiiiciency of operation of the device capable of being obtained therefrom.

Any variation in space relation of theelectrodes4 due to vibration lor shock by reason of external environment, such as may occur in aircraft, mobile equipment, on board ship or in other applications where the filament or the grids are liable to vibrate or be permanently distorted to change the stable space relation of the electrodes .will produce corresponding changes in space current and therefore have a detrimental eifect on the operation of the device by causing undesired current variations and loss in' efliciency.

The primary object of this invention is to substantially prevent vibrational interference being transmitted to electron discharge devices mounted in electrical energy translating apparatus.

Another object of the invention is to diminish I the effect of sudden shock on the electron discharge device to avoid variation in operating characteristics thereof.

rupture stresses on the rubber cushion are avoided by limiting the range of movement of the cushion primarily when inserting or removing the discharge device withtrespect to the mounting. This is accomplished by providing exten` sions on the platform which form limit ,stops for the socket carried by the platform. Y Another feature of the invention relates to the arrangement of the limit stops" with respect to the damping member of the assembly; In a preferred arrangement, the extensions on the platform encompass a flange plate of the ldamping at an angle to a vertical plane. This construction involves the addition of an adjustable counterweight'on the sidef of the cushion member opposite to the device to balance various sizes of discharge devices and prevent contact4 with the panel or other rigid surface which will communicate mechanical vibration to the discharge device.

'I'hese and other features of the inventionwill be more clearly understood from the following detailedv description when considered with the accompanying drawing:

Fig. 1 is a side view in elevation of the cushion vmounting in accordance with this invention;

Fig. 2 is aside view rotatedl90 degreesin elevation of the mounting shown in Fig. 1;

Fig; 3 shows the mounting in the same rela-v tion as in Fig. 1, but partly in cross section taken on line 3-.-3 of Fig.` 2, to show the detailed ar- .rangement of the various parts of the mounting:

for direct connection to associated partsof the assembly in which the rubber exhibits a shear strain characteristic, which provides the maximum degree of' protection from disturbing vibrational frequencies by utilizing the low natural period and high deflection characteristlcsoi' the soit' rubber. The mounting also involves a platform coupled to the damping member which supports a socket intermediate theplatform and a base or .panel for supporting the discharge device. A

A feature oi the assembly relates toa on4 mounting of the shear in which excessive Fig. 4 is a. plan view of the cushion damping member;

Fig. 5 is a cross-sectional view of the damping member taken on line 5-5 of Fig. 4;

Fig. 6 shows the mounting on the rear of a vertical panel with the adjustable counterweight to offset the weight of the discharge device supported in the mounting;

Fig. 7 is a front view ofthe mounting showing v the socket for supportingvthe discharge device:

and

Fig. 8 shows a modied structure of the mounting in .cross section in which the socket isl vapplied to a base plate or panel I0 having a large circular opening Il for inserting an electron discharge device m the mounting. This" mounting is disposed at the rear of the panelso that the panel presents a substantially unobstructedsurface from the front thereof when installed in operating position in any energy translating or communicating equipment.- Of course, the invention is not limited to this specific application since the cushion mounting may be disposed in other appropriate locations depending on the use of the equipment and the effect desired in the equipment. As shown in Fig.

1, the specific mounting oi this invention isapplied to the rear of the panel I by mounting. -a plurality oi rearwardly extending posts I2 disposed in equally spaced relation around the opening II in the panel. -These posts are secured to one of the main `elements of the mounting by being attached to the four corners of a rectangular iiange member I 3 which is embedded in the peripherv of a disc of soft rubber cushion Amaterial Il having a central hub portion I5 of increased thickness with a metallic sleeve I6 extending therethrough and rigidly bonded to the hub portion, as shown in Figs. 3. and 5. The

circular disc Il is also formed with an annular intermediate portion of reduced thickness hetween the periphery and the hub to render the soft rubber more kresilient and elastic to deflection forces in all directions.

A rigid platform plate I1 is centrally afilxed to the sleeve `I6 of the cushion member Il by a screw and nut I8.- pair of posts I9 which extend toward the panel I0 to support a wafer type or other suitable socket 20 by oppositely disposed ears 2l to position the 35 socket intermediate the panel and cushion member and in coaxial alignment with the opening l I I in the panel. l

Since the peripheral `flange I3 of the cushion member is rigidly fixed in the mounting and the platform and socket assembly which constitutes the movable mass is aixed to the center of thev cushion mem-ber, any deection forces acting on the assembly will be absorbed by the soft rubber cushion I4 which is yieldable in all directions due to its coniiguration and the strain imposed on the rubber cushion will place the rubber in shear with respect to the metallic insert bonded therein. whereby the maximum degree of protection is afforded against vibrational interference due to the low natural period of the rubber material and the high deflection characteristic thereof. g v

However, in order to protect the'cushion member Afrom abnormal disruptive stress, such as oc curs when a discharge device is inserted in or removed fromthe socket member '20, as is usual in push type sockets, the' platform plate I1 is pro. vided with a pair of oppositely disposed exten-v sions 22 which project downwardly andare bent inwardlyI to form limit stops 23 and 24, respectively, on opposite sides of theperipheral flange I3 of the cushion member. The limit stop 24 engages theflange I3l when a discharge device is inserted in the socket to prevent excessive strain on the cushion I4, whilel the limit stop 23 engages the flange when the device is removed from the socket.

The cushion mountingl of this invention may also be applied to a vertical panel, as shown in Fig. 6, wherein a discharge device 25 is inserted in the push type socket 26, the socket .being provided with a plurality of openings 26 for the terminal pins of the discharge device and a central index bore 21 having an oiset slot`28 to receive This platform carries a discharge device to properly locate the device in' the -socket with respect to the various terminal openings 26. As shown in Fig. 6 the index pln 5 29 of the discharge device projects through the socket so that the socket must be mounted in suitable space relation with respect to the platform I1 of the mountin'g. When the cushion mounting is employed in a vertical panel, the excess weight o1' the discharge device necessarily unbalances the mounting assembly which may result in a transmission ot external vibrations to the electrodes of the discharge device, due to contact of the shell of the device with the lower edge of the panel through which it extends. In order to overcome this diiliculty, in accordance with this invention, a counterweight 3o is aiiixed to the bottom4 of the'screw I 8 extending through the platform and the `hub of the cushion member to reestablish the balance in the mounting, so that the discharge device is maintained coaxial with the opening II and entirely i'ree from the edge of the opening in the panel. 'I'he counterweight 30 therefore maintains the axis of the mounting and the discharge device perpendicular to the panel I0 yet permits the cushion member Il to and thereby protects the discharge device from these extraneous disturbances. 'I'he counterweight 2l may be adjusted on the screw I 2 for dierent sizes and weights of discharge devices supported in the lsocket 20 to compensate for diierences in balance to. maintain the discharge device free from contact with the panel.

A modiiication of the mounting o! this invention is shown -in Fig. 8, in which the rubber cushion is provided with a cup-shaped iiange member 3l having its inner edge embedded in the peripheral portion of the cushion and the outer individual support of an electron discharge devvice in which the' discharge device extends through an opening in a base plate or panel and is supported in a depressed position to eliminate capacitive and inductive disturbances which might aiect theperformance of the discharge device. Furthermore, the cushion mounting adequately 'protects the discharge device from 6o extraneous vibration and shock which would materially affect the spacial relation of the electrodes therein and therefore maintains the discharge deviceV in stable operating condition even .that various modications may be made in the,

elemental parts without departing from the scope of the invention as dened in 754 claims. v

eiliclently dampen or absorb vibrations or shocks the appended What is claimed is: l

1. A cushion mounting for an electron discharge device comprising a base plate, a resilient damping member having a metallic rim bonded therein, means rigidly securing said rim to said plate, a platform rigidly attached to said member, and a socket adapted \to receive said device mounted between said plate andsaid platform and supported by said platform.

2. A cushion mounting for an electron discharge device comprising a base plate, a yieldable damping member having metallic elements bonded therein, securing means extendin'g between said plate and one of said metallic elements, a platform directly attached to the other of said metallic elements, and a socket adapted to receive said discharge device spaced from and mounted on said platform.

3. A resilient mounting for afn electron discharge device comprising a base member. a cushion member having a peripheral ange embedded therein supported from said base member, a rigid member attached to said cushion member, a socket for said discharge device secured to said rigid member and positioned between said base member and rigid member, and

means on said rigid member for limiting the stress placed upon said cushion lmember, said means being adapted to engage said ange.

4. A resilient mounting for an electron discharge device comprising an apertured base', a

vibration damping member having a rigid peripheral iiange embedded therein and supported on one side of said base in alignment with the aperripheral ilange embedded therein and supported on one side of said base in alignment with the aperture therein, a rigid member centrally attached to said damping member, said rigid mem-l ber having integral extensions encomp said flange to limit reciprocal movement of said damping member, and a socket adapted to receive said discharge device through said apertured base being supported on said rigid member between said base and said rigid member.

6. A cushion mounting for an electron discharge device comprising abase plate, a damping member, means securing said member to said plate, a platform centrally attached to said mem- 8. In combination, a mounting panel havingA an opening, posts extending rearwardly from said panel around said opening, a circular cushion member of soft rubber material having a central sleeve and a peripheral flange bonded in said rubber material, said posts being secured to said f flange, a platform plate interposed between said panel and said cushion member, means on said platform to limit the movementthereof with respect to said cushion member, a counterweight remote from said panel, a socket adapted to re-l ceive said discharge device spaced from said panel in 'coaxial alignment with said opening. and means iixedly securing said platform and counterweight to the sleeve of said cushion member.

9. In combination, a mounting panel having an opening, posts extending rearwardly from said panel around said opening, a circular cushion member of soft rubber material having a central sleeve and a peripheral flange bonded in said rubber material, saidposts being secured to said flange, a platform plate interposed between said panel and said cushion member, said platform having integral extensions with portions located in uniform relation on opposite sides of said flange to limitreciprocal movement of saidA platform with respect to said cushion member, a counterweight remote from said panel, a socket adapted to receive said discharge device spaced from said panel in coaxial alignment with said opening, posts carried by said platform for supporting said socket, and a single member extending through said sleeve for connecting said platform and counterweight centrally to said cushion on opposite sides thereof.

, 10. A cushion mounting for an ellect'ronldis-- charge device for mounting on a panel comprising a platform member, a socket on one side of said platform member and spaced therefrom, a resilient member on the other side of said platform having a metallic member peripherally secured thereto, and means for rigidly connecting said metallic member to said panel.

HARRY C. RUBLY.

GIARENCE H. YOUNG. 

